BSTJ 35: 4. July 1956: Automatic Testing of Transmissin and Operational Functions of Intertoll Trunks. (Felder, H.H.; Pascarella, A.J.; Shoffstall, H.F.)
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The Bell System Technical Journal (1922-1983) The Magazine Rack Additional Collections Science and Scientific MagazinesUploaded by Jason Scott on